1 Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, 17 Hougouhutong Street, Dongcheng District, Beijing, 100005, China.
2 Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Science, 1 Dongjiaominxiang Street, Dongcheng District, Beijing, 100730, China.
3 Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Science, 1 Dongjiaominxiang Street, Dongcheng District, Beijing, 100730, China. wuliubj@yahoo.com.